Collapsible core for wall molds



March 17, 1942. E. L; SIEMER COLLAPSIBLE CORE FOR WALL MOLDS 3Sheets-Sheet 1 Filed April 10, 1939 v INVENTOR.- Z' WARD L. JYEMATTORNEY.

E Nu m v bN unk . EYE i \Q March 17, 1942. 'E. L. SIEMER COLLAPSIBLECORE FOR WALL MOLDS s Sheets-Sheet 2- Filed April 10, 1939 0 REE SINVENTOR. EDWARD/L jE'ME Mafia/b4:

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March 17, 1942. E. SIEMER 2,276,422

COLLAPSIBLE CORE FOR WALL MOLDS Filed April 10, 1939 3 Sheets-Sheet 3 vb1 5e. 1.

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\ IN VENTOR. Z'DwA ML. SIEMEB ATTORNEY.

Patented Mar. 17, 1942 UNITED STATES ATENT OFFlCE 2 Claims.

My invention relates to new and useful improvements in a collapsibleform for plastic material, and has for its principal object to constructhollow walls for business, residential buildings, or other purposes.

A further object of my invention is to cast a hollow wall monolithicallywith respect to its shells and bonds connecting the shells.

A still further object of my invention is to cast a hollow wall as meansto insulate against high or low degrees of temperature, and beingimpervious to moisture passing through the wall.

A still further object of my invention is to provide collapsible formsfor the hollow and external faces of the wall, the forms to be withdrawnor removed without serious deterioration thereof, so that the same canbe applied repeatedly.

A still further object of my invention is to provide a metallicstructure for the forms so that an interior face of the wall may beribbed to receive and retain a plastic finish as in the case of ordinaryconstruction, while the outside face of the wall may be decorated byembossing the form ornamentally, which in turn will reproduce in thecast of the wall, and the said formed plates may be straight and smoothto produce a like surface for the wall.

These and other objects will hereinafter be more fully explained,reference being had to the accompanying drawings, forming a part of thisspecification, in which like characters will apply to like parts in thedifferent views.

Referring to the drawings:

Fig. l is a side View of a collapsible core to produce a hollow wall inthe course of casting the same.

Fig. 2 is an edge view of Fig. 1.

Fig. 3 is an enlarged upper end view of the core.

Fig. 4 is an enlarged sectional view taken on line 44 in Fig. 3.

Fig. 5 is an outside elevation of the panels constituting forms for thesides of the wall, parts removed for convenience of illustration.

Fig. 6 is an inside view of Fig. 5, parts removed for convenience ofillustration.

Fig. '7 is a vertical edge view of Fig. 6.

Fig. 8 is an upper end view showing the interlocking feature of thepanel edges.

Fig. 9 is an edge view of the cap as an enclosure for the top of thecore.

Fig. 10 is an underside view of Fig. 9.

Fig. 11 is an upper side view of Fig. 9.

Fig. 12 is a plan view at the upper end of the form assembly prior toplacing plastic material therein,

Fig. 13 is a side elevation of Fig. 12.

Fig. 14 is a side view of one of the spreaders and fragmentary portionof the vertical bar support.

Fig. 15 is a transverse view tothat shown in Fig. 14.

Fig. 16 is a plan view showing the assembly of the forms as applied tothe corner structure of the wall.

Fig. 1'7 is a side view of the centrally disposed strut member for thecore, the position of which is shown in Fig. 3.

Fig. 18 is the plan view of a wall fragmentarily shown as cast in theassembled forms, the forms being removed.

Fig. 19 is an inside elevation of a wall and a sectional View of theright angle portion through the hollow thereof, illustrating ahorizontal ribbed surface.

Fig. 20 is an elevation of the wall as over coated, the right angleportion being in vertical section between the cores.

My invention herein disclosed consists of a collapsible core and panelsto form the exterior of a wall, the core comprising two side plates I,having offsets formed in the body as at A as stifiening means for theplates longitudinally, and the said plates being connected at theiropposing edges by end plates 2 having similar olfsets for a similarpurpose to that of the side plates.

It will be seen that the edges of said side and end plates convergedownward for the removal of the core by drawing the same upward whenplastic substance poured in the forms is well set.

As a means to reinforce the side and end plates of the corelongitudinally, there is placed medially of their respective members achannel 3, the legs of which are preferably welded to the body of theplates as shown in Fig. 3.

It will be understood that the side and end plates interlock where theiredges meet as a convenient meansto withstand an outward pressure imposedat the time of pouring plastic substance in the forms, and also asslideable means to remove the said end members that is accomplished byinserting a hook-like structure in apertures B, punched near the upperend of each of said channel elements, as shown in Fig. 4.

To resist an inward thrust of plates I toward each other, there isplaced therebetween a strut member 4, having a like convergence downwardto that of the end plate members as a convenient means to remove thesame in like manner provided for the plates by an upward pull,

at which time the side plates are free to flex in-' ward toward eachother sufiiciently to break the bond of the plastic substance externallyapplied. To avoid rigid adhesion of plastic to the exterior of the core,there should be applied to the outer surface of the core a coat ofparaffin or the like liquified by an appropriate solvent.

The forms for the outside of the plastic wall consist of two ply panels5 and 6, preferably spot welded together. Fly 5 has a plurality ofriblike indentures horizontally disposed and in close relation with eachother, as shown in Fig. 6, while ply 6 consists of a smooth fieldportion having a plurality of channel members 1 spaced apart, verticallypositioned, and secured thereto by welding, as shown in Fig. 5.

Being so arranged, it will be seen that the ribs of plate 5 and thechannels of plate 6 transversely cross each other as reinforcing meansto resist deflection of a side thrust of the plastic substance whilebeing poured or rammed.

It will also be seen that the ribbed side of the panel will be placedinward at the time of assembling the form and the channel elements,being outward, and the said panels being connected at their abuttingedges by an interlap, as shown in Fig. 8, rendering the joint fluidtight' and smooth adjacent the wall. The said panels each have apertures8 punched a spaced distance from the upper and lower ends, and centrallythereof, and being spaced apart horizontally to correspond at intervalswith the solid portion of the walls that divide the hollows formed bythe cores, at which point, selectively, a tie rod 9 extends therethroughto bind the panels in spaced relation and in parallelism with eachother. There is also provided for each tie rod a hollow spreader I0,rectangular in cross section through which said rod extends, thespreader functioning as a separator for the panels, and supported invertical alignment and in registry with their respective apertures inthe panels by a bar 5 I, channellike in cross section, and being punchedthrough its web to receive said spreader securely therein, and the saidducts being apertured along their four sides through which plasticsubstance will enter to fill the hollow, and the said tie rods extendoutward through their respective apertures in the panels and through anapertured timber I2, as shown in Fig. 13, the ends of the rods beingbent at right angles and stapled as at C as a convenient securing meansto avoid separating of the panels. To remove said panels, the bentportions of said rods are brought to an alignment to freely slide fromengagement with their respective apertures provided therefor, and uponremoval of the panels the outward extending portion of the rods areremoved by cutting the same flush with the plastic wall.

The said forms above described, when set in position to receive plasticmaterial therein, the top of each core will be closed temporarily by acap l3 as a shield against said plastic substance entering the core, andthe said caps being perforated as at D respectively, and in which issecured one end of anchor rods E, while the other ends are secured intheir respective apertures F and G in the panels and legs of saidchannel bar II, by which means the upper end of the core isconcentrically maintained to the panels and channel bars, while thelower ends are retained in like position by gravity, seated on thefoundation of the wall.

The substance from which the wall is constructed may be of an aggregatesimilar to that of concrete, or a fibrous pulp may be employed and welltamped as placed in the forms. In case of the latter, an electric orother heating element may be placed downward in the hollow of the wallto assist in drying the pulp when rapid action is desired in a course ofconstruction.

It will be understood that sub-jambs or the frames may be placed in theforms for window or door openings, and the said panels and cores beingarranged to conform thereto. Furthermore, nailing blocks may be appliedwithin the forms, seating in the wall, and to which the finish or trimfor the openings and base members may be attached by nailing or theapplication of screws, and the said blocks being secured by adhesion ofthe plastic substance thereto, and the said window and door frames maybe placed within the sub-jamb arrangement or by removing the same, inwhich case, appropriate nailing blocks will be secured in the jambs ofthe openings. In case of wide openings, there should be provided areinforced lintel, the ends of which will bear upon the solid portionbetween the hollows, by which means, ample carrying capacity is providedfor joist bearings or a poured concrete floor or ceiling.

This principle of form arrangement may be applied for the pouring ofbasement or retaining walls, and for fire walls in the case of abusiness structure in a fire restricted district.

It will be seen that a wall thus constructed is adaptable for theinstallation of a conduit, also flues by an appropriate lining for thehollow of the wall, and a wall constructed of pulp is easily cut for theinstallation of window or door openmgs.

The forms herein set forth are preferably made of sheet metal, but notrestricted to such alone, as fibrous sheets may be adopted with suitablereinforcement, in which case, it is simple to arrange for theinstallation of doors and windows in the wall, and such othermodification may be made as lie within the scope of the appended claims.

Having fully explained my invention what I- claim as new and desire tosecure by Letters Patent is:

1. A collapsible removable core form for a concrete wall comprisingsides and end walls oppositely disposed, respectively, each of said endwalls converging downward edgewise, the edges of each end wall beingbent in such a way as to interlap to avoid collapsation by an outwardpressure, a strut member converging downward edgewise to correspond withthe convergence of the end walls, the said strut member engaged betweenthe sides intermediate of their edges to avoid collapsation by anexterior pressure.

2. A collapsible removable core form for a concrete wall comprisingsides and end walls oppositely disposed, respectively, each of said endwalls converging downward edgewise, the edges of each end wall beingbent in such a way as close the same while plastic concrete is beingpoured.

EDWARD L. SIEMER.

